Which hard drive for Time Machine?

Hi Ive just bought a macbok pro, it has an internal hard drive of 160Gb so I was thinking for time machine i should get an external hard drive of 160Gb also? Which hard drive is best for this, I dont really want to pay over £70?

There are a lot of hard drives out there that are fairly cheap now. www.frys.com has deals here and there where a 500gb hard drive will be like $50, say microcenter and so forth. I think I've even seen a 1TB hard drive for like $79 once from frys. You can try newegg and amazon.com as well.
But I'd say go for the bigger drive if the price fits. Can't be too safe about more space
-Tony

For Time Machine you want a drive bigger than your internal disk, so when you make backups, multiple versions can be stored (hence "Time Machine")

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A bigger drive will give you lots of backup history, but you really don't need such a large drive to keep several months of backups. TM doesn't backup the OS files, so that saves about 10GB. And then after the initial backup, TM only updates the new/deleted/changed files. So unless you are processing GBs of movies every day, it will take a long time to fill up a drive that is equal to or a bit less than the size of your system drive.

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